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 <span id="projectnumber">74.2</span>
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<li class="navelem"><a class="el" href="namespaceicu.html">icu</a></li><li class="navelem"><a class="el" href="classicu_1_1ByteSink.html">ByteSink</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> </div>
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<div class="title">icu::ByteSink Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<p>A <a class="el" href="classicu_1_1ByteSink.html" title="A ByteSink can be filled with bytes. ">ByteSink</a> can be filled with bytes.
<a href="classicu_1_1ByteSink.html#details">More...</a></p>
<p><code>#include <<a class="el" href="bytestream_8h_source.html">bytestream.h</a>></code></p>
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Inheritance diagram for icu::ByteSink:</div>
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<div class="center">
<img src="classicu_1_1ByteSink.png" usemap="#icu::ByteSink_map" alt=""/>
<map id="icu::ByteSink_map" name="icu::ByteSink_map">
<area href="classicu_1_1UMemory.html" title="UMemory is the common ICU base class. " alt="icu::UMemory" shape="rect" coords="107,0,312,24"/>
<area href="classicu_1_1CheckedArrayByteSink.html" title="Implementation of ByteSink that writes to a flat byte array, with bounds-checking: This sink will not..." alt="icu::CheckedArrayByteSink" shape="rect" coords="0,112,205,136"/>
<area href="classicu_1_1StringByteSink.html" title="Implementation of ByteSink that writes to a "string". " alt="icu::StringByteSink< StringClass >" shape="rect" coords="215,112,420,136"/>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ac3e9a257c1fd9e981bceb8f6981d9b6e"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1ByteSink.html#ac3e9a257c1fd9e981bceb8f6981d9b6e">ByteSink</a> ()</td></tr>
<tr class="memdesc:ac3e9a257c1fd9e981bceb8f6981d9b6e"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <a href="#ac3e9a257c1fd9e981bceb8f6981d9b6e">More...</a><br /></td></tr>
<tr class="separator:ac3e9a257c1fd9e981bceb8f6981d9b6e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aeea90b9a402f4446d493f7e6cc3361c0"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1ByteSink.html#aeea90b9a402f4446d493f7e6cc3361c0">~ByteSink</a> ()</td></tr>
<tr class="memdesc:aeea90b9a402f4446d493f7e6cc3361c0"><td class="mdescLeft"> </td><td class="mdescRight">Virtual destructor. <a href="#aeea90b9a402f4446d493f7e6cc3361c0">More...</a><br /></td></tr>
<tr class="separator:aeea90b9a402f4446d493f7e6cc3361c0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a61fe994281322e8a3e3ed2e50c910e41"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1ByteSink.html#a61fe994281322e8a3e3ed2e50c910e41">Append</a> (const char *bytes, int32_t n)=0</td></tr>
<tr class="memdesc:a61fe994281322e8a3e3ed2e50c910e41"><td class="mdescLeft"> </td><td class="mdescRight">Append "bytes[0,n-1]" to this. <a href="#a61fe994281322e8a3e3ed2e50c910e41">More...</a><br /></td></tr>
<tr class="separator:a61fe994281322e8a3e3ed2e50c910e41"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2d5b62995d93a766a52651fcac809591"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1ByteSink.html#a2d5b62995d93a766a52651fcac809591">AppendU8</a> (const char *bytes, int32_t n)</td></tr>
<tr class="memdesc:a2d5b62995d93a766a52651fcac809591"><td class="mdescLeft"> </td><td class="mdescRight">Appends n bytes to this. <a href="#a2d5b62995d93a766a52651fcac809591">More...</a><br /></td></tr>
<tr class="separator:a2d5b62995d93a766a52651fcac809591"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aceeb6e6dd959bf559b7c5e656e3ba107"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1ByteSink.html#aceeb6e6dd959bf559b7c5e656e3ba107">AppendU8</a> (const char8_t *bytes, int32_t n)</td></tr>
<tr class="memdesc:aceeb6e6dd959bf559b7c5e656e3ba107"><td class="mdescLeft"> </td><td class="mdescRight">Appends n bytes to this. <a href="#aceeb6e6dd959bf559b7c5e656e3ba107">More...</a><br /></td></tr>
<tr class="separator:aceeb6e6dd959bf559b7c5e656e3ba107"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a391838e3698a0132097ff2877565aaee"><td class="memItemLeft" align="right" valign="top">virtual char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1ByteSink.html#a391838e3698a0132097ff2877565aaee">GetAppendBuffer</a> (int32_t min_capacity, int32_t desired_capacity_hint, char *scratch, int32_t scratch_capacity, int32_t *result_capacity)</td></tr>
<tr class="memdesc:a391838e3698a0132097ff2877565aaee"><td class="mdescLeft"> </td><td class="mdescRight">Returns a writable buffer for appending and writes the buffer's capacity to *result_capacity. <a href="#a391838e3698a0132097ff2877565aaee">More...</a><br /></td></tr>
<tr class="separator:a391838e3698a0132097ff2877565aaee"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad8b12cabefa31cfcdd1dc166a9f829f2"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1ByteSink.html#ad8b12cabefa31cfcdd1dc166a9f829f2">Flush</a> ()</td></tr>
<tr class="memdesc:ad8b12cabefa31cfcdd1dc166a9f829f2"><td class="mdescLeft"> </td><td class="mdescRight">Flush internal buffers. <a href="#ad8b12cabefa31cfcdd1dc166a9f829f2">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A <a class="el" href="classicu_1_1ByteSink.html" title="A ByteSink can be filled with bytes. ">ByteSink</a> can be filled with bytes. </p>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000050">Stable:</a></b></dt><dd>ICU 4.2 </dd></dl>
<p class="definition">Definition at line <a class="el" href="bytestream_8h_source.html#l00053">53</a> of file <a class="el" href="bytestream_8h_source.html">bytestream.h</a>.</p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ac3e9a257c1fd9e981bceb8f6981d9b6e">◆ </a></span>ByteSink()</h2>
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<td class="memname">icu::ByteSink::ByteSink </td>
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<p>Default constructor. </p>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000053">Stable:</a></b></dt><dd>ICU 4.2 </dd></dl>
<p class="definition">Definition at line <a class="el" href="bytestream_8h_source.html#l00059">59</a> of file <a class="el" href="bytestream_8h_source.html">bytestream.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aeea90b9a402f4446d493f7e6cc3361c0">◆ </a></span>~ByteSink()</h2>
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<td class="memname">virtual icu::ByteSink::~ByteSink </td>
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<p>Virtual destructor. </p>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000054">Stable:</a></b></dt><dd>ICU 4.2 </dd></dl>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a61fe994281322e8a3e3ed2e50c910e41">◆ </a></span>Append()</h2>
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<td class="memname">virtual void icu::ByteSink::Append </td>
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<td class="paramtype">const char * </td>
<td class="paramname"><em>bytes</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int32_t </td>
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<p>Append "bytes[0,n-1]" to this. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">bytes</td><td>the pointer to the bytes </td></tr>
<tr><td class="paramname">n</td><td>the number of bytes; must be non-negative </td></tr>
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</dd>
</dl>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000055">Stable:</a></b></dt><dd>ICU 4.2 </dd></dl>
<p>Implemented in <a class="el" href="classicu_1_1StringByteSink.html#ae452e5c53dc33bdcb83fbc27585264d0">icu::StringByteSink< StringClass ></a>, and <a class="el" href="classicu_1_1CheckedArrayByteSink.html#ac5b828c4a8c4d65fdca6860f02e72c89">icu::CheckedArrayByteSink</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a2d5b62995d93a766a52651fcac809591">◆ </a></span>AppendU8() <span class="overload">[1/2]</span></h2>
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<td class="memname">void icu::ByteSink::AppendU8 </td>
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<td class="paramtype">const char * </td>
<td class="paramname"><em>bytes</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int32_t </td>
<td class="paramname"><em>n</em> </td>
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<p>Appends n bytes to this. </p>
<p>Same as <a class="el" href="classicu_1_1ByteSink.html#a61fe994281322e8a3e3ed2e50c910e41" title="Append "bytes[0,n-1]" to this. ">Append()</a>. Call <a class="el" href="classicu_1_1ByteSink.html#a2d5b62995d93a766a52651fcac809591" title="Appends n bytes to this. ">AppendU8()</a> with u8"string literals" which are const char * in C++11 but const char8_t * in C++20. If the compiler does support char8_t as a distinct type, then an <a class="el" href="classicu_1_1ByteSink.html#a2d5b62995d93a766a52651fcac809591" title="Appends n bytes to this. ">AppendU8()</a> overload for that is defined and will be chosen.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">bytes</td><td>the pointer to the bytes </td></tr>
<tr><td class="paramname">n</td><td>the number of bytes; must be non-negative </td></tr>
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</dd>
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<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000056">Stable:</a></b></dt><dd>ICU 67 </dd></dl>
<p class="definition">Definition at line <a class="el" href="bytestream_8h_source.html#l00085">85</a> of file <a class="el" href="bytestream_8h_source.html">bytestream.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aceeb6e6dd959bf559b7c5e656e3ba107">◆ </a></span>AppendU8() <span class="overload">[2/2]</span></h2>
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<td class="memname">void icu::ByteSink::AppendU8 </td>
<td>(</td>
<td class="paramtype">const char8_t * </td>
<td class="paramname"><em>bytes</em>, </td>
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<td class="paramtype">int32_t </td>
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<p>Appends n bytes to this. </p>
<p>Same as <a class="el" href="classicu_1_1ByteSink.html#a61fe994281322e8a3e3ed2e50c910e41" title="Append "bytes[0,n-1]" to this. ">Append()</a> but for a const char8_t * pointer. Call <a class="el" href="classicu_1_1ByteSink.html#a2d5b62995d93a766a52651fcac809591" title="Appends n bytes to this. ">AppendU8()</a> with u8"string literals" which are const char * in C++11 but const char8_t * in C++20. If the compiler does support char8_t as a distinct type, then this <a class="el" href="classicu_1_1ByteSink.html#a2d5b62995d93a766a52651fcac809591" title="Appends n bytes to this. ">AppendU8()</a> overload for that is defined and will be chosen.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">bytes</td><td>the pointer to the bytes </td></tr>
<tr><td class="paramname">n</td><td>the number of bytes; must be non-negative </td></tr>
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<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000057">Stable:</a></b></dt><dd>ICU 67 </dd></dl>
<p class="definition">Definition at line <a class="el" href="bytestream_8h_source.html#l00101">101</a> of file <a class="el" href="bytestream_8h_source.html">bytestream.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ad8b12cabefa31cfcdd1dc166a9f829f2">◆ </a></span>Flush()</h2>
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<p>Flush internal buffers. </p>
<p>Some byte sinks use internal buffers or provide buffering and require calling <a class="el" href="classicu_1_1ByteSink.html#ad8b12cabefa31cfcdd1dc166a9f829f2" title="Flush internal buffers. ">Flush()</a> at the end of the stream. The <a class="el" href="classicu_1_1ByteSink.html" title="A ByteSink can be filled with bytes. ">ByteSink</a> should be ready for further <a class="el" href="classicu_1_1ByteSink.html#a61fe994281322e8a3e3ed2e50c910e41" title="Append "bytes[0,n-1]" to this. ">Append()</a> calls after <a class="el" href="classicu_1_1ByteSink.html#ad8b12cabefa31cfcdd1dc166a9f829f2" title="Flush internal buffers. ">Flush()</a>. The default implementation of <a class="el" href="classicu_1_1ByteSink.html#ad8b12cabefa31cfcdd1dc166a9f829f2" title="Flush internal buffers. ">Flush()</a> does nothing. </p><dl class="stable"><dt><b><a class="el" href="stable.html#_stable000059">Stable:</a></b></dt><dd>ICU 4.2 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a391838e3698a0132097ff2877565aaee">◆ </a></span>GetAppendBuffer()</h2>
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<td class="memname">virtual char* icu::ByteSink::GetAppendBuffer </td>
<td>(</td>
<td class="paramtype">int32_t </td>
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<p>Returns a writable buffer for appending and writes the buffer's capacity to *result_capacity. </p>
<p>Guarantees *result_capacity>=min_capacity. May return a pointer to the caller-owned scratch buffer which must have scratch_capacity>=min_capacity. The returned buffer is only valid until the next operation on this <a class="el" href="classicu_1_1ByteSink.html" title="A ByteSink can be filled with bytes. ">ByteSink</a>.</p>
<p>After writing at most *result_capacity bytes, call <a class="el" href="classicu_1_1ByteSink.html#a61fe994281322e8a3e3ed2e50c910e41" title="Append "bytes[0,n-1]" to this. ">Append()</a> with the pointer returned from this function and the number of bytes written. Many <a class="el" href="classicu_1_1ByteSink.html#a61fe994281322e8a3e3ed2e50c910e41" title="Append "bytes[0,n-1]" to this. ">Append()</a> implementations will avoid copying bytes if this function returned an internal buffer.</p>
<p>Partial usage example: int32_t capacity; char* buffer = sink->GetAppendBuffer(..., &capacity); ... Write n bytes into buffer, with n <= capacity. sink->Append(buffer, n); In many implementations, that call to Append will avoid copying bytes.</p>
<p>If the <a class="el" href="classicu_1_1ByteSink.html" title="A ByteSink can be filled with bytes. ">ByteSink</a> allocates or reallocates an internal buffer, it should use the desired_capacity_hint if appropriate. If a caller cannot provide a reasonable guess at the desired capacity, it should pass desired_capacity_hint=0.</p>
<p>If a non-scratch buffer is returned, the caller may only pass a prefix to it to <a class="el" href="classicu_1_1ByteSink.html#a61fe994281322e8a3e3ed2e50c910e41" title="Append "bytes[0,n-1]" to this. ">Append()</a>. That is, it is not correct to pass an interior pointer to <a class="el" href="classicu_1_1ByteSink.html#a61fe994281322e8a3e3ed2e50c910e41" title="Append "bytes[0,n-1]" to this. ">Append()</a>.</p>
<p>The default implementation always returns the scratch buffer.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">min_capacity</td><td>required minimum capacity of the returned buffer; must be non-negative </td></tr>
<tr><td class="paramname">desired_capacity_hint</td><td>desired capacity of the returned buffer; must be non-negative </td></tr>
<tr><td class="paramname">scratch</td><td>default caller-owned buffer </td></tr>
<tr><td class="paramname">scratch_capacity</td><td>capacity of the scratch buffer </td></tr>
<tr><td class="paramname">result_capacity</td><td>pointer to an integer which will be set to the capacity of the returned buffer </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>a buffer with *result_capacity>=min_capacity </dd></dl>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000058">Stable:</a></b></dt><dd>ICU 4.2 </dd></dl>
<p>Reimplemented in <a class="el" href="classicu_1_1CheckedArrayByteSink.html#a16eb07406d3b1c68989025e7f136aa2d">icu::CheckedArrayByteSink</a>.</p>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li>common/unicode/<a class="el" href="bytestream_8h_source.html">bytestream.h</a></li>
</ul>
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